{#搜索框和搜索按钮#}
<div class="form-group">
    <input type="text" name="user_search" id="user_search" class="form-control aa_search"
           placeholder="Search" value="{{ search }}">
</div>
<button type="submit" class="btn btn-default" id="aa_search"
        aa_search="{{ search }}"><span class="glyphicon glyphicon-search" aria-hidden="true"></span> 搜索
</button>